The Collaborative International Dictionary
Mephitic \Me*phit"ic\, Mephitical \Me*phit"ic*al\, a. [L. mephiticus, fr. mephitis mephitis: cf. F. m['e]phitique.]
Tending to destroy life; poisonous; noxious; as, mephitic exhalations; mephitic regions.
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Offensive to the smell; as, mephitic odors.
Mephitic air (Chem.), carbon dioxide; -- so called because of its deadly suffocating power. See Carbonic acid, under Carbonic.
Wiktionary
a. (alternative form of mephitic English)
Usage examples of "mephitical".
In one corner an anthracite stove, glowing red and mephitical, vied with a roaring gasoven in another corner to raise the atmosphere to roasting-pitch.
Faintly at first, but more strongly as they went on, there came to them an insidious feeling of somnolence, such as might have been caused by mephitical effluvia.